/**
*      author: Y_Yao
*      created: 2025-04-12 20:02:52
**/

#include<bits/stdc++.h>

#define int LL
using namespace std;
using LL = long long;
const LL LLINF = 9e18;
const int INF = 0x3f3f3f3f;

void solve()
{
    int n;
    cin >> n;
    int ans = 0;
    bool flag = false;
    for(int i = 1;i <= n;i++)
    {
        string s;
        cin >> s;
        if(s == "login")
        {
            flag = true;
        }
        if(s == "logout")
        {
            flag = false;
        }
        if(flag == false && s == "private")
        {
            ans++;
        }
    }
    cout << ans << endl;
}

signed main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);

    int t = 1;
    // cin >> t;
    while(t--)
    {
        solve();
    }
    return 0;
}